Sound-box for talking-machines.



PATENTED SEPT. 3, 1907.

E.IR.JOHNSON. SDUND BOX FOR TALKING MACHINES.

APPLIUATION FILED APR. 7, 1903.

7 INVENTOR idriigefidbkmn nramx.

UNITED STATES PATENT OFFICE.

ELDRIDGE R. JOHNSON, OF PHILADEIiPHL-LPENNSYLVANIA, ASSIGNOR TO VICTOR TALKING MACHINE COMPANY, A CO LPORATION OF NEW JERSEY.

SOUND-BOX non TALKING-MACHINES.

To all whom-it may concern.-

Be it known that I, ELDRIDGE R. JonNsoN, a citizen of the United States, and a resident of the city of Phila delphia, State of Pennsylvania have invented certain new and useful Improvements in Sound-Boxes for 'lalking-ll/lachinos, of which the following is a full, clear, and complete disclosure.

,My invention relates to sound boxes for talking ma chines, and more particularly to novel means for mounting the stylus bar of such a sound bar, having for its object to provide a mounting that will make the box extremely sensitive to accurately reproduce the recorded vibrations, as will be hereinafter fully described and claimed.

For a lull, clear and exact description of the particular construction I have selected to illustrate my in? vcntion reference may be had to the following specification and lo the accompanying drawing forming a part thereof in which r Figure 1, is a sectional elevation of a portion of my improved sound box showing the stylus bar and its connection in position therein; Fig. 2 a sectional view of a slightnlodilication oi the means for producing an elastic tension; Fig. 3, a detail view oithe stylus bar and its suspension detached from the sound box; Fig. 4 al'ront elevation of Fig. 3; Fig. 5 a sectional elevation of a modified form of the means for producing a tension upon the stylus bar; Fig. (5 a front elevation of the stylus bar and its connecting parts, shownin Fig. 5, detached; Figs. 7, and 8, show. means for varying the tension upon the suspension shown in Figs. 5 and (i and Fig. 9, a view showing aportion oi the edge of the sound box.

The numeral 1 indicates the sound box casing which has the usual diaphragm 2 yieldingly mounted therein and retained in position in any suitable manner such as by'the flange 3 and the perforated disk 4.

The sound box casing l is provided at substantially diametrically opposite points with holes or openings 5 and (i. The lower opening 6 is somewhat larger than the opening 5 and is adapted to receive the stylus bar 7 so that thelattor may have aslight lateral play therein.

' The stylus bar 7 is provided with the usual boss 8 which is adapted to 'recdive the set screw 9 for retaining the needle or stylus' in position. The stylus bar 7 is also provided with a knife edge or pivot 11 which is adapted to engage the'outer surface oi the sound box and have a bearing thereon. Small cuts or recesses 26 are provided to receive the knife edge-on the sur- 50 face of the sound box adjacent the opening 6. The I stylus bar 7 i s-also'providcd with an eye in -socket 12 which is adapted to receive one end of the wire *or elastic suspension 13. The other end of wire or suspension 13 passes through the opening 5 in the sound box casing and engages a spring hook 14 which is re- Specification of Letters Patent. Application filed April 7,1903.' Serial m1. 151,453.

' Patented Sept. 3, 19017.

tained in position upon the ouside of the sound hon casing by means of a screw or similar device 15, the one gagement between said wire or suspension 13 and hook 14 being to one and the same sideol the bearing bar 7, as the engagement between said suspension. 13 and the said bar. The plate or material of which said hook is formed is provided with an elongated slot l6 for allowing of an adjustment of the hook in relation to the screw 15. The book 14 may be substantiallystraight asshown in l or maybe bent at an angle and attached to the iront. of the sound box as illustrated in Figs. 2 and 3.

It will now be seen that the knife edge 11 is for ed into contact with the surface of the sound box by means of the suspension 13 and the tension placed upon the latter may be varied according to the elasticity and position of the hook 14 or of the hook 1.7. The latter is so designed that the said tension will be such as to produce the best results in relation to the character of the sound record and alter the parts are placed in position the hook ll or 17 may be adjusted within certain limits.

In Figs. 5 to 8 inclusive I have illustrated another form of my improved means for retaining the stylus bar in position. The. stylus bar 18 is provided with knife edges ll similar to those above described but instead of having an eye or socket 12 a hole 1.) is placed in the stylus bar 18 substantially in line with the knife edge ll through which the suspension 20 is adapted to pass. This suspension 20 consists of a continuous loop of Wire or other strong'niaterial which. passes thn'mgh the hole 19 and is adapted to engage the book 21 which passes through an openim 22 diametricallyopposite theopening (5 through which the stylus bar passes, the cngagenient between said suspension 20 and hook 21 being also located to one and the same side of the bearing of the bar 18, as the engagement between said suspension and bar. The opening 22 is preferably square in cross section and is adapted to carry a square plug 23 which is attached to the hook 21. A thumb nut 224 permits a longitudinal adjustment oi the hook 2] so that the tension upon the suspension 20 may be varied after the parts are in position in a manner similar to that above described in connection with the first form.

The upper end of the stylus bar is, of course, in each case connected to the diaphragm 2 by means of the wire or similar device 25. In either form the suspensions 13 or 20 are slightly elastic under tension,

or in other words, act as springs and allow of a lateral Having thus described-my invention, what I claim and desireto protectby Letters Patent in the United States; is V 4, 4 p

1: In a sound recording and reproducing machine the combination: with sound boxcasing of a diaphragm, a stylus an; a t ransverse-bearing located on the exterior of the sound hozgcasing said bearingholdlng said stylus bar against longitudinal movement in one direction, the said stylus bin-having an opening adjacent said bearing, an

elastic suspension loop passing through said opening, and means at the opposite side 05 the casing for adjustably supporting said loop. 2. In afsound recording and reproducing machine; thecomhinatlon with a sound box casingof a diaphragm, a

stylus ban having a, 'ti-a nsvei-se bearing ljournaledon the. exterior of ilie sound box casing, an elastic suspension loop the casing for adjustably supporting said wirel.

passing through an opening in said stylus bar within the sound box casing,'and .betwee'n they-limbs of which said stylu's bar is situated, a-screw threaded hook at the other end of said ioop, the screw threaded portion of said hook passing through an opening on outside of the'sound box casing opposite that through which the stylus bar projects. andan adjusting nut situated on the outside of the casing and engaging said screw threaded portion of the hook.

,- 4. In a sound box recording and reproducing machine,

the combination with a sound box casing of a diaphragm, a stylus bar, an axial bearing locatedjon the exterior of the sound box casing, the said bearing holding said stylus bar against longitudinal movement in one direction; a suspenslon wire'pas'sing through an opening in said stylus..- bar adjacent said bearing, said wire tensioning said heaI'-, ingagainstsaid casing, and means at the oppositesideof 40 In witness whereof, I havehereunto set my hand this 30th day of March, A. D. 1903.

. 'ELDRIDGE R. JOHNS DN.

' Witnesses:

Lns'rnn L. Bnrs'ron, Rosn CHEVALIER. 

